Hi
As You probably have observed, herptiles fall in different kinds of drainages and wells. In my neighbourhood there is a problem with drainage manholes like this one below.
When crossing roads, road traffic is not the only problem for herptiles, there are also high curbs (that can't be passed by newts and often toads) and mentioned drainage manholes. Herptiles which can't pass crubs walk along it till they are smashed by car or swooped into manholes. Usually amphibians migrate during rainy weather, so they find water column in a height of horizontal drainpipe, what allows them to continue wandering further into drainage system till ther stuck somewhere. Here is the list of species whose I encountered in drainage manholes:
Triturus cristatus
Lissotriton vulgaris
Bombina bombina
Pelobates fuscus
Bufo bufo
Pseudepidalea viridis
Rana esculenta complex
Rana temporaria
Rana arvalis
Natrix natrix
I suppose, that amphibians that are looking for place to hibernate are attracted by high humidity in drainage manholes and as a result they are falling into them. Sometimes I have been finding them death, ill or in agonal state. For example- toad with an eye infection
Crested newt with injured leg
My experience shows, that rescuing amphibians is most effective at night, during or after rain. Animals are released in possibly safe, nearby location. When it is cold I use gloves to handle with them, not to transmit heat. Sometimes long stick is very useful to place herptiles in a dredge to pick them up. I recommend to find out if there is a similar problem in Your area. In my street I have rescued moor frog and green toads although there is no big reservoir in neighbourhood. Are constructions like this http://www.amphibtec.ch/4.1deramphibienschacht.html present in Your country?
moor frog
common toad, crested newts, common brown frog, green frogs, spadefoot toad
smooth and crested newts
B. bombina
L. vulgaris
P. fuscus
some of rescued amphibians
Greetings
Michał Szkudlarek